Add notes on Java build systems

Notes and Research/maven_vs_gradle.md

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+[Maven Vs Gradle - Which To Pick - YouTube](https://www.youtube.com/watch?v=5P9cb0xWyO0)
+- both **Dependency Management and Build Automation tools**
+- **possible** to switch between them, but not ideal
+- very similar core functionality
+[Gradle | Gradle vs Maven Comparison](https://gradle.org/maven-vs-gradle/)
+[Maven – Introduction](https://maven.apache.org/what-is-maven.html)
+
+# [Maven](https://maven.apache.org/)
+- XML (eXtensible Markup Language)
+- **Quicker** to learn
+- 75% **industry adoption** (from 4 years ago)
+- **Convention** over **configuration**
+# [Gradle](https://gradle.org/)
+- DSL (Domain-Specific Language)
+- Better **scaling** for complex projects
+- The clear winner in **build speed** using incremental builds
+- Emphasis on **extensibility**
+# Raw Java
+- No external setup
+- No automation - run commands manually
+	- Might have some assistance from IDE